Fix the test to follow new getter syntax.

tests/compiler/dart2js/unparser_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #import('dart:uri');
 #import('parser_helper.dart');
 #import('mock_compiler.dart');
 #import("../../../lib/compiler/compiler.dart");
 #import("../../../lib/compiler/implementation/dart_backend/dart_backend.dart");
 #import("../../../lib/compiler/implementation/elements/elements.dart");
@@ skipping 406 matching lines @@
 testLibraryGetSet() {
   var librarySrc = '''
 #library('mylib');
 
 get topgetset => 5;
 set topgetset(arg) {}
 ''';
   var mainSrc = '''
 #import('mylib.dart', prefix: 'mylib');
 
-get topgetset() => 6;
+get topgetset => 6;
 set topgetset(arg) {}
 
 main() {
   topgetset;
   topgetset = 6;
 
   mylib.topgetset;
   mylib.topgetset = 5;
 }
 ''';
@@ skipping 59 matching lines @@
   testVariableDefinitions();
   testGetSet();
   testFactoryConstructor();
   testAbstractClass();
   //testConflictSendsRename();
   testNoConflictSendsRename();
   testConflictLibraryClassRename();
   testDefaultClassWithArgs();
   testClassExtendsWithArgs();
   testStaticInvocation();
-  // testLibraryGetSet(); // http://dartbug.com/4604
+  testLibraryGetSet();
   testFieldTypeOutput();
   testDefaultClassNamePlaceholder();
 }